Instrumentals used to give me fits! We had an automated FM station near me (one that I later worked for!) back in the pre-internet age. Whenever they played something that I was not familiar with, I could usually figure out the title and look it up in my Whitburn book. Not so with instrumentals, of course! (Later, when I worked for that same station, I could usually use the Whitburn book to look up anything that a listener might call about. Of course, that was usually rather rare for me by then, because I usually knew who sang what!)